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The flow chart below represents a series of reactions starting with ethanoic acid:-
(a) Identify substances A and B
(b) Name the process I
Date posted:
November 6, 2019
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Find the value of k in the equation.
125k+1 + 53k = 630
Date posted:
November 6, 2019
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The structure below represents a cleansing agent.
a) State the type of cleansing agent represented above
b) State one advantage and one disadvantage of using the above cleansing agent.
Date posted:
November 6, 2019
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Find the value of x given that 
is a singular matrix.
Date posted:
November 6, 2019
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Give the IUPAC name for each of the following organic compounds;
Date posted:
November 6, 2019
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The difference between two positive integers is 5 and the sum of their squares is 73. Find the integers.
Date posted:
November 6, 2019
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If cos α = 15/17 , find without using tables or calculator
Tan (180- α)
Date posted:
November 6, 2019
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Study the scheme given below and answer the questions that follow;
i) Name the reagents used in:
Step I:
Step II
Step III
ii) Write an equation to show products formed for the complete combustion of CH = CH
iii) Explain one disadvantage of continued use of items made form the compound formed in step III
Date posted:
November 6, 2019
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The cost of mass production of cars is partly constant and partly varies as the number of cars produced. The total cost of making 400 cars is sh 3,740,000 and that of making 1000 cars is sh 7,100,000. Find the cost of making 2500 cars.
Date posted:
November 6, 2019
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Solve the inequality below. Hence represent the solution on a number line.
x < 2x + 7 ≤ - 1/3x + 14
Date posted:
November 6, 2019
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Using logarithms tables: Evaluate.
Date posted:
November 6, 2019
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a) Give the names of the following compounds:
i) CH3CH2CH2CH2OH
ii) CH3CH2COOH
iii) CH3C – O- CH2CH3
Date posted:
November 6, 2019
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A shopkeeper sells two types of chewing gum. Big G and Orbit. Each big G costs sh. 3 and each orbit costs sh. 4. The shopkeeper has put aside sh. 300 for the purchase of gums. He needs at least twice as many Big G as Orbit and there must be at least 50 Big G and at least 20 orbit. Let x represent the number of Big G and y the number of orbit the shopkeeper purchases.
(a) Write down all the inequalities representing the information
(b) Represents the inequalities in (a) graphically
(c) The shopkeeper makes a profit of sh. 1.00 on each big G and sh. 1.50 on each orbit.
(i) Find the number of gums of each type that would give him maximum profit
(ii) Hence find the maximum profit
Date posted:
November 6, 2019
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The table below shows income tax rates
Mr. Kiprono is employed and housed by a company. For which he pays a normal rent of Sh. 2000. He earns a basic salary of Ksh. 32,000 pm. He is also given taxable allowances amounting to ksh. 8480.
(a) Calculate his taxable income in K£
(b) Determine his total income tax in Ksh.
(c) If he pays a monthly water bill of Ksh. 350, electricity bill of Ksh. 400 and is a member of a cooperative
and pays Ksh. 2500 pm. Determine his net monthly income.
Date posted:
November 6, 2019
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Study the schematic diagram below and answer the questions that follow:-
(i) Identify the following:
Substance Q
Substance R
Gas P
(ii) Name:
Step 1
Step 4
(iii) Draw the structural formula of the major product of step 5
(iv) State the condition and reagent in step 3
Date posted:
November 6, 2019
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Study the scheme below and use it to answer the questions that follow:-
i) Name the following compounds:-
I. Product T ………………………… II. K ………
ii) State one common physical property of substance G
iii) State the type of reaction that occurred in step J
iv) Give one use of substance K
v) Write an equation for the combustion of compound P
vi) Explain how compounds CH3CH2COOH and CH3CH2CH2OH can be distinguished chemically
vii) If a polymer K has relative molecular mass of 12,600, calculate the value of n (H=1 C =12)
Date posted:
November 6, 2019
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Name the compound with the formula below :
CH3CH2CH2ONa
Date posted:
November 6, 2019
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Mr. Karanja owns a bicycle which he sometimes rides to go to work. Out of the 21 working days in a
month, he only rides to work for 18 days. If he rides to work, the probability that he is bitten by a
rabid dog is 4/15 otherwise its only 1/13. When he is bitten by the dog, the probability that he will get
treatment is 4/5 and if he does not get treatment the probability that he will get rabies is 5/7.
(a) Draw a tree diagram to show the events
(b) Using the tree diagram in (a) above, determine the probability that
(i) Karanja will not be bitten by a rabid dog
(ii) He will get rabies
(iii) He will not get rabies if he does not get treatment
Date posted:
November 6, 2019
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State two factors that affect the properties of a polymer
Date posted:
November 6, 2019
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State why C2H4 burns with a more smoky flame than C2H6
Date posted:
November 6, 2019
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The structure below shows some reactions starting with ethanol. Study it and answer the questions that follow:
(i) Write the formula of the organic compounds P and S
(ii) Name the type of reaction, the reagent(s) and condition for the reactions in the following steps :-
(I) Step I
(II) Step II
(III) Step III
(iii) Name reagent R ……………………………………………………………
(iv) Draw the structural formula of T and give its name
(v) (I) Name compound U………………………………………………………..
(II) If the relative molecular mass of U is 42000, determine the value of n (C=12, H=1)
Date posted:
November 6, 2019
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Machine A can complete some work in 8 hours while machine B can complete the same work in 10 hours. The two machines were set to do the work at the same time. After 3 hours, machine B broke down. Determine the time taken by machine A to complete the remaining piece of work.
Date posted:
November 6, 2019
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Solve for x in the equation.
6sin2 x - cos x – 5 = 0
for 00 ≤ x ≤ 360
Date posted:
November 6, 2019
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The third term and the sixth term of a geometric series are 3 1/3 and 11 1/4 respectively. Calculate the
(a) Common ratio
(b) First term
Date posted:
November 6, 2019
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PQ is a diameter of a circle is such that the co-ordinates of P and Q are (-6, -2) and (4, -2)
respectively. Find the equation of the circle in the form ax2 + by2 + cx + dy + e = 0 where a,b,c,d and
e are constants.
Date posted:
November 6, 2019
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Give the IUPAC names of the following compounds:
Date posted:
November 6, 2019
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Three variables P,Q and R are such that P varies directly as the cube of Q and inversely as the square root of R. If Q is increased by 20% and R is decreased by 10%, Find the percentage change in P.
Date posted:
November 6, 2019
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Draw a diagram to show a system that is controlled through feedback.
Date posted:
November 6, 2019
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Why is feedback necessary in a system?
Date posted:
November 6, 2019
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(a) What is absolute ethanol?
(b) State two conditions required for process G to take place efficiently
Date posted:
November 6, 2019